Whichever one that you are comfortable with. I grew up on Humminbird but have not upgraded to MEGA yet; I already had the non-MEGA 360 but wanted FFS. I was about to upgrade to a MEGA Helix and get a MEGA Live, but Bass Pro Shops had a sale on a Garmin LVS32 with GLS10 (block box) kit and Echomap UHD 93sv that allowed me to get into Livescope and Garmin. Now, I still want Humminbird for 360 and can go either HB or Garmin for the console since I have flexibility using both. Lowrance has a good FFS system as well, which is why I say whatever you are comfortable with.
If I'm not at work or taking kids to their activities, you might find me on "The Rez" fishing. If not there, I could be in the garage working on my boat.